Interrupter for rincing-circuits.



H. D. CURRIER.

INIERRUPIER FOR RIN'GING CIRCUITS.

APPLICATION FILED Nov. I9.'I9I4.

Patented Oct. 17,1916.

WZYEEE E5. EL/5277277' Umrnn sseancesy resiente ernten,

Humm-m T:IIRAI'Iv D. CURRIER, 0F CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITCHBOARD AND SUPPLY COMPANY, 0F CHICAGO, ILLINOIS, A CRPORATON OF ILLINOIS.

INTERRPTEB FOR RINGING-CIRCITS.

(mnu

Specification of Letters Patent.

Patented Get. I7, 1916.

To all whom 'it may concern 'for Ringing-Circuits, of which the following is a specification.

My invention relates to interrupters for ringing circuits such as are used in connection with telephone systems. In telephone systems wherein so-called autorisatie or machine ringing is employed, ringing current usually is applied intermittently to the called line and for this purpose interrupter devices of various kinds are used for interrupting the ringing relays in order to secure intermittent ringing periods. In connection with such systems it is desirable that the exchange be divided into sections so that the ringing current is taken from the,A ringing generator at different periods in order to more equally distribute the load. Therefore the interrupter devices are usually arranged so as to provide a number of different interruptor circuits. The most common means employed for this purpose is a motor driven interrupter device and it has been found comparatively expensive especially in the smallerexchanges One of the principal objects of the present invention is to provide a simple, compact and coml'iaratively inexpensive interrupter device and to this end I preferably employ a number of relays cooperating in such a manner as to provide one or more interruptor circuits.

In the preferred form of my invention I employ eleven relays, this combination giving four interrupter leads operating at different times. That is the four interrupter leads are closed and opened successively at different periods; Of course it is to be understood that the preferred form shown is more for the purpose of illustration as it will readily be seen after becoming familiar with the invention that other' arrangements will readily occur to those skilled in the art.

My invention is adapted for other uses, but for the purpose of illustration, I have shown the interrupter of my invention operating in connection with a cord circuitequipped with automatic ringing.

Referring now in general to the interrupter circuits A in which the apparatus is in its unactuated position, it comprises preferably eleven relays a to 7c inclusive, the relays a to e' being slow acting relays and the relays j and 7c quick acting. Relays a to z are preferably adjusted alike, and so as to release their armature in about a half of a second after interruption of their circuits. This gives about one second ringing and four seconds silence.

To further illustrate my invention I have shown a cord circuit D for interconnecting two substations B and C which terminate in line circuits L and L1 respectively, coinprising line relays LR, cut-off relays CO, line signals S and multiple jacks J. VThe cord circuit D is designed for automatic ringing and I have shown the interruptor circuitv A in operative relation therewith. The cord circuit D comprises the usual answering and calling plugs P and P1, an-

swering and calling supervisory relays AS and CS, and supervisory lamps SS and S51. The automatic ringing apparatus of the cord circuit D comprises a partyline ringing key RK, four ringing generators G, G1, G2 and G3, a ringing control relay RCR, an interrupter relay IR, and a switching relay SW.

For the purpose'of describing my invention, it will be assumed that the interrupter circuit A is' associated with a 12 position switchboard equipped with cord circuits as D. The interrupterA` has four interruptor leads l, 2, 3, 4, controlled by the operation of different connecting relays in the interrupter circuit and are multiply connected to different positions of the switchboard preferably as follows: The lead 1 is common to the cordcircuits D of the first, fthand ninth positions, lead 2 to the second, sixth and tenth positions, lead 3 to the third, seventh and eleventh positions, and lead 4 to the fourth, eighth and twelfth positions.`

The interrupter circuit A is constantly operating but may be shut off by switch 5() in the battery lead. I will now describe one complete cycle of operation of the interrupter, and assuming that the apparatus is in condition as illustrated, a circuit for the relay a. is first established traced from battery, the conductor through a, conductor (3, normal contact 7 of the relay to ground.

The energization of relay b also closes a circuit for relay c from battery, conductor 5, through relay c, alternate contact 1l conductor 9 to ground whereupon a circuit is closed for the relay from battery, conductor 5,A through relay d, alternate contact 12 conductor 9 to ground. lhe relay Z energizing closes circuit for rela-y e from battery, conductor 5, through relay e, alternate contact 13, conductor 9 to ground. rlthe relayl 3 is thus energized and closes circuit for the relay f from battery, conductor 5, relay alternate contact le, conductor 9 to ground, and relay f in 'turn closes a circuit through connecting relay g from battery, conductor through relay g, alternate contact l5, conductor 9 to ground. Relay g 'l'.herelore closes circuit for relay It from battery, conductor 5, 'through relay L, alter` nate contact 16, conductor 9 to ground, and a circuit for 'the relay is thus closed from battery, conductor 5 through relay z', alternate contact 17, conductor 9 to ground. rThus all oi' the re a vs o. 'toi are energized, having come up successively'but of course in a fraction ot' second. Upon the energization of the relay e', the energizing circuit for relay o is opened at normal contact 7 of relay z' lausing denergization ott relay a after a short period. ltelay (l denergizing opens the circuit for relay 7J at its alternate contact 8 and the relayl Z1 denergizing opens its alternate contact 19 which opens the interrupter lead 1 and closes its normal contact 10 which establishes an energizing circuit for ySconnecting relay j from battery conductor 5, normal contact 10, through relay y', conductor 18, alternate contact 19 (still closed) conductor 9 to ground. Relay j now energizes and closes its alternate contact 20 placing the interrupter lead 2 in operative relation with its associated cord circuits in the second, sixth and tenth positions. Relay o having denergized opens the circuit for relay c which in 'turn opens the circuit for relay cl and relay flopens the circuit for relay c which relay c deenergizing opens its a`ternate contact 19 to restore 'the relay y' and "open the interrupter lead rlhe denergization of relay e again closes its normal contact 19 which establishes an energizingcircuit for connecting relay L from battery, conductor 5, alternate contact 21, conductor 22, through relay 7s and normall contact 19 to groui'id.` Relay 7c energia.

ing closes its alternate contact 23 which places the lead in operative relation with its associated cord circuits. The relay c deenergizing opens, the circuit for the relay f which.y in turn opens the circuit oi' connecting relay o and the relay g denergizing opens its alternate contact 21 which interrupts the circuit of the relay tvvhich now disconnects lead 3 from its associated cord circuits. Relay g deenergizing again closes its normal contact 21 placing the interrupter lead 4l in operative relation with its associated cord circuits and opens the circuit for relay h` upon denergization of which the circuit for relay is interrupted. Relay i denergizing closes its normal contact 7 which again completes a lcircuit for the relay a followed by the successive operations of the other relays as before. I have found by experiment that by timing the relays so that one cycle of operation occurs in five seconds, very satisfactory results are attained as this places each interrupter lead in operative relation with its associated cord circuits for one second of time, and disassociates each one for a period of four seconds.

I will now describe the interrupter circuit A operating in connection with the cord circuit D, which we will assume is one of the fifteen cord circuits of the first position .with which the interrupter lead 1 is common. Assuming a subscriber at substation A wishes to converse with a subscriber at substation G, the removal of the receiver at substation B closes an energizing circuit for the line relay LR to light line signal S. rllhe operator now inserts the plug P into the jack J, operating the cut-oli relay C@ from battery through the impedance coil R, the contacts of the plug P and jack J through C() to ground, which interrupts the energizing circuit of the line relay LR to eliace the line signal S. The answering super visory relay AS is also operated from battery through the coil l), through the substation, tlie winding of relay AS to ground, opening` its normal Contact to prevent the premature lighting of supervisory signal SS.

Assuming that substation C is wanted and its line is idle the operator inserts the plug P1 into the jack J1 closing an energizing circuit for the cut-oli' relay CO1 and switching relay SW in series from battery through the winding of relay SW, sleeve contacts of the plug l and jack J1, the winding of relay CO1 to ground. The relay SW closes its alternate contact 24C, closing a circuit for the supervisory signal SSI which remains lighted until the called for subscriber answers. rlhe operator now fully depresses the proper ringing plunger, 71, 7), p2 or 7) o'l' the party line ringing key RK, and assun'iiug that it is the plunger 7? which is depressed, the end springs 2li, 27 momentarily assume their alternate positions, the .spring 27 closing an energizing circuit for the ringing control relay RCR, traced from battery, through the wnding of relay RCR, conductor 2S, alternate Contact 27, conductor 29, normal contact 25 and alternate contact 2lto ground. Although the circuit of relay RCR is interrupted at contact Q7 when the operator removes pressure from'the actuated plunger, the relay RCR closes a locking eircuit for itselrn traced from battery, the alternate Contact 30 ot the relay RCR, normal contact :25 of relay CLS, alternate contact of relay Sill to ground. Upon the energization of the relay RCR, itsalternate contact 231 is closed, 'which connects interrupter `lead l of the interrnpter circuit A with CJR the interrupter relay Ill of the cord circuitA D. Assuming that the relay L of the interrupter circuit A is in its energized condition as before described and its alternate contact l() closed, an energizing circuit for the relay IR is established traced from battery, conductor 5, alternate contact l0 of relay b, interrupter lead l, alternate contact 3l, normal contact 26, through the winding ot relay 1R to ground. Upon energization of relay 1R it closes its alternate contact 32 which connects ringing current to the called line from the ungrounded pole of the generator G, alternate Contact 7?, the alternate Contact 32, t-he alternate contact 33, tip contacts of the plug l and jack J1, through the condenser and call bell of the called substation C, the sleevefcontacts of the jack J1' and plug P1, the alternate Contact 34 of the relay 1R to battery and ground. The relay R is energized each time the interrupter lead l is connected to battery through con tacts of relay Z. As betere described the interrupter relay IR is energized each time the relay b of the interrupter circuit A is energized, thus connecting ringing current to the wanted line for about one second or" the time and allowing a. silent interval of about four seconds which are the intervals that the relay Z1 remains energized and de energized,

lVhen the called subscriber answers an energizing circuit for the relay CS is established over the line and opens its normal Contact which interrupts the locking circuit for relay RCR, which denergizes and opens the circuit of relay 1R at its alternate contact 31. The opening of alternate contact 31 disconnects the lead l which prevents the relay lll from again operating. The opening ot' contact i" ot relay CS el'faces the signal SSX ,Vhen conversation has been completed and the receivers have been replaced on their respective switch-hooks, the v relays AS and @is oianergize to again light the supervisory signals SS and Still whereupon the operator withdraws i'ilngs l) and l* from the jacks .l and J1 restoring the cord and link circuits.

From the foregoing it will be seen how the lfonr connectingv relays 7), 17.,/1 and g successively energize theI interrupt-er leads, l, 2, 3 and l respectively, the slow action of the relays f/ to inclus-ine giving ringing and silent periods ot' sullicient duration. It will be evident that b v increasing or diminishingrr the speed of these, relays (L: to z' the ringing and silent periods may be varied. 'It

pended claims.

Having` described my invention, what I claim as new and desire to secure by United States Letters Patent is:

l. An interruptor system of the character described comprising a series ot relays, a

source of current` circuit connections be.

tween said relays iior eii'ectingl an automatic continuous sequential energization and deenergization thereof, the last relay of the series operating to denergize the relays of the series each time that it is energized, and a plurality of interrupter leads connected to different ones of said relays whereby successive energizations of said. leads are efl fected. Y

2. An interrnpter system of the character described comprisingr a' series of relays, a source of current, circuit connections be,- tween said relays for effecting an automatic continuous seqriential energization and deenergization thereot,one relay of the series controlling a substantially simultaneous en ergization of the relays of the series, and interrupter leads extending from contacts of different ones of said relays whereby said leads are intermittently energized at different periods for the different leads.

3. An interi-unter system ot the character f described comprising a series of relays, a source of current, interrupter leads extending from contacts of certain ones of said relays, and circuit connections between said relays whereby the first relay of the series controls the successive energization of the relays in the series and the last relay in the series controls the successive denergization oli' the relays in the series for effecting energizations and denergizations of short and long periods respectively of said interrupter leads.

t?. An interrupter system of the character described comprising a series of electromagnets, contacts controlled thereby, a source of current, circuit connections between said e-lectrolnagnets and contacts whereby when the first electromagnet ot the. series is energized the other electromagnets are succes` sively energized and whereby when the last electromagnet ot' the. series is energized the electromagnets of the series are delinergized,

and interriniter leads connected to certain described comprising; a series of relays, a source of current, circuit connections whereby when the first relay of the series is energized, it operates to energize the series of relays and whereby when the last relay of the series is energized, it operates to denergize the series of relays, and interrupter leads extending` from contacts of diiierent ones of said relays whereby said source of current is successively connected toi and then successively disconnected from said leads. l

G. An interrupter system of the character described comprising a plurality lof relays certain of which are connecting relays, in-

terrupter leads extending` from .contacts of the connecting` relays, a source of current, and circuit connections extending between certain of the contacts of said relays and the electromagnets ot the relays whereby an automatic continuous energization and deenergization of said relays is effected to successiyely operate the ringing lead contacts intermittently, one relay of said plurality of relays controlling the energization of a series of said relays and another of said rclays controlling` the denergization of the said series of relays.

7. An interrupter system of the character described comprising a series of relays, a

source of operating' current, circuit connec tions between said relays whereby the iirst relay ot the series causes the consecutive enengization of said series of relays and whereby the last relay of the series causes the consecutive deencrgization of the relays of the series, and interrupter leads connected to contacts of certain or' said relays whereby said leads are intermittently closed at difierent periods for the different leads.

S. An interrupter system of the character described comprisiiig a series of relays, a source of operating` current, circuit connections betweens said relays whereby one relay of the series causes the consecutive energization of said series of relays and whereby another relay oi the series causes the consecutive denergization of the relays of the series, and interrupter leads connected to contacts of certain of said relays whereby said leads are intermittently closed at different periods for the diiiere'nt leads.

9. An interrupter system of the character described comprising` a series of relays, a source oi' current, circuit connections between said relays whereby when the iirst relay of the series energizes the remaining relays are energized consecutively and whereby when the last relay of the series energizes the first relay of the series denergizes and operates to denergize the other relays consecutively, and a plurality of interrupter leads connected to different ones of said relays whereby successive energizations of said leads are effected.

l0. An interrupter system of the character described comprising a series or' relays, circuit connections extending between said relays foreti'ecting an automatic continuous consecutive energization and denergization thereof, the first and, last relays of the series controlling the energization and deenergization of the relays of the series, a source of current, and interrupter leads eX- tending from contacts of certain of said relays whereby said source of current is intermittently connected to said interrupter leads.

l1. An interrupter system of the character described comprising a series of relays, a source of current, interrupter leads, and connections between said relays for effecting an automatic continuous energization and denergization thereofl effective to connect said source of current to said leads at different periods, the first relay of the series controlling the energization of the relays of the series and the last relay of the series controlling the de'e'nergization of th'e relays of the series.

l2. An interrupter system of the character described comprisinga series of relays, a.'

series are energized in rotation and whereby i when the last relay of the series energizes the first relay of the series denergizes and operates to denergize in rotation all of the relays in the series, and interrupter leads extending from contacts of different ones of said relays, said relays operating to connect said source of current intermittently to said interrupter leads at different periods for the diiierent leads.

13. An interrupter system of the class described comprising a series of slow acting relays, a source of current, interrupter leads, circuit connections between said relays whereby the energization of one of said relays causes substantially the simultaneous energization of the other relays of the series and the energization of another one of said relays causes the relays of the series to denergize slowly and consecutively,'said operation of said relays operating to diii`erentially connect said source of current to said interrupter leads. I

Signed by me at Chicago, county of Cook and State of'lllinois, in the presence of two witnesses` GEORGE E. MUnLLnR,

M. lt. RooHroRD. 

